DG I appreciate your extra effort and tenacity trying to get me squared away.

I’ve got the upper line on the throttle body going to the canted port (B) on the thermo vac valve; your research verifies this is correct, so half the riddle is solved. You indicate that the lower throttle body line goes to a purge valve. I’m uncertain what a purge valve is. I currently have the lower line hooked up to some kind of valve, that was left in my engine bay, after the Malay of reconstruction. For various reasons, I believe it to be the correct location for this line. It is a black plastic valve, shaped like an acorn, about the size of a golf ball, with three vacuum line connections coming from it. One from the top (if it was an acorn, it would be the top) that is a larger ID line. This is where I have the lower throttle body line plugged in. One from the bottom (again, if it was an acorn) which is a smaller ID line. This is where I have the line from the thermo vac valve port A plugged in. There is also a connection on the acorn valve in the center, that I currently have plugged. I don’t think I have a charcoal canister, I don’t remember seeing one on the 1990 300E donor car either. If I would have it, where would it be?

I think I’m of at least average intelligence; but this is starting to make my head hurt. I’m starting to feel like a dullard; can you help me along some more?